NXP Semiconductors FRDM-KL25Z Freedom Development Board

You can program the board via its integrated OpenSDA debug interface. By default, it appears as a USB mass storage device; simply drag-and-drop compiled .bin or .hex files. For advanced debugging, configure the OpenSDA firmware to use the P&E Multilink interface, compatible with IDEs like MCUXpresso, Keil MDK, or IAR Embedded Workbench. The board is also fully supported by the online Arm Mbed compiler for cloud-based development.

The board is designed for ultra-low-power operation and can be powered via the micro-USB connector (5V) or through the 3.3V pin on the expansion headers. Its Kinetis KL25Z MCU features multiple low-power sleep modes, making it suitable for battery-powered applications. Typical operating current depends on active peripherals and clock speed, but deep sleep currents can be in the microamp range for extended battery life.

Yes, the FRDM-KL25Z is officially supported as a development target by the Zephyr Project, a scalable real-time operating system for connected, resource-constrained devices. You can set up the Zephyr SDK, configure the board target (frdm_kl25z), and build sample applications for Bluetooth Low Energy, sensors, or networking protocols to develop production-ready IoT firmware.

The capacitive touch slider is connected to the MCU's TSI (Touch Sense Input) peripheral. The MMA8451Q accelerometer is connected via I2C. Example code is available in the mbed online library and NXP Semiconductors's MCUXpresso SDK. For mbed, include the 'mbed' library and use the 'DigitalIn' API for the slider and the 'MMA8451Q' driver library for the accelerometer to read data with simple function calls.